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                                    A well is dry in a bed of rock containing fluorspar `(CaF_(2))`. If the well contains `20,000 L` of `H_(2)O`, what is the amount of `F^(-)` in it `K_(SP)` of `CaF_(2) = 4 xx 10^(-11)`A. `4.3` moleB. `6.8` moleC. `8.6` moleD. `13.6` mole | 
                            
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Answer» Correct Answer - C `CaF_(2) hArr Ca^(2+) + 2F^(-)` `K_(SP) = 4S^(3) = 4 xx 10^(-11)` `rArr S = 2.15 xx 10^(-4) M` Amount of `F^(-)` in `20,000 L` Sol. `= 2 xx 20,000 xx 2,15 xx 10^(-4) = 8.6` mole  | 
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